References

https://en.wikipedia.org/wiki/Immune_system

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https://myhealth.alberta.ca/health/pages/conditions.aspx?Hwid=center1024

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https://www.britannica.com/science/immune-system

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https://kidshealth.org/en/parents/immune.html

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https://www.health.harvard.edu/staying-healthy/how-to-boost-your-immune-system

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https://www.betterhealth.vic.gov.au/health/ConditionsAndTreatments/immune-system

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https://kids.kiddle.co/Image:Neutrophil_with_anthrax_copy.jpg

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https://www.betterhealth.vic.gov.au/health/ConditionsAndTreatments/immune-system